1 /* 2 * Copyright (c) 1983, 1988, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #ifndef lint 31 static const char copyright[] = 32 "@(#) Copyright (c) 1983, 1988, 1993, 1994\n\ 33 The Regents of the University of California. All rights reserved.\n"; 34 #endif /* not lint */ 35 36 #ifndef lint 37 #if 0 38 static char sccsid[] = "@(#)syslogd.c 8.3 (Berkeley) 4/4/94"; 39 #endif 40 #endif /* not lint */ 41 42 #include <sys/cdefs.h> 43 __FBSDID("$FreeBSD$"); 44 45 /* 46 * syslogd -- log system messages 47 * 48 * This program implements a system log. It takes a series of lines. 49 * Each line may have a priority, signified as "<n>" as 50 * the first characters of the line. If this is 51 * not present, a default priority is used. 52 * 53 * To kill syslogd, send a signal 15 (terminate). A signal 1 (hup) will 54 * cause it to reread its configuration file. 55 * 56 * Defined Constants: 57 * 58 * MAXLINE -- the maximum line length that can be handled. 59 * DEFUPRI -- the default priority for user messages 60 * DEFSPRI -- the default priority for kernel messages 61 * 62 * Author: Eric Allman 63 * extensive changes by Ralph Campbell 64 * more extensive changes by Eric Allman (again) 65 * Extension to log by program name as well as facility and priority 66 * by Peter da Silva. 67 * -u and -v by Harlan Stenn. 68 * Priority comparison code by Harlan Stenn. 69 */ 70 71 #define MAXLINE 1024 /* maximum line length */ 72 #define MAXSVLINE 120 /* maximum saved line length */ 73 #define DEFUPRI (LOG_USER|LOG_NOTICE) 74 #define DEFSPRI (LOG_KERN|LOG_CRIT) 75 #define TIMERINTVL 30 /* interval for checking flush, mark */ 76 #define TTYMSGTIME 1 /* timeout passed to ttymsg */ 77 #define RCVBUF_MINSIZE (80 * 1024) /* minimum size of dgram rcv buffer */ 78 79 #include <sys/param.h> 80 #include <sys/ioctl.h> 81 #include <sys/mman.h> 82 #include <sys/stat.h> 83 #include <sys/wait.h> 84 #include <sys/socket.h> 85 #include <sys/queue.h> 86 #include <sys/uio.h> 87 #include <sys/un.h> 88 #include <sys/time.h> 89 #include <sys/resource.h> 90 #include <sys/syslimits.h> 91 #include <sys/types.h> 92 93 #include <netinet/in.h> 94 #include <netdb.h> 95 #include <arpa/inet.h> 96 97 #include <ctype.h> 98 #include <err.h> 99 #include <errno.h> 100 #include <fcntl.h> 101 #include <libutil.h> 102 #include <limits.h> 103 #include <paths.h> 104 #include <signal.h> 105 #include <stdio.h> 106 #include <stdlib.h> 107 #include <string.h> 108 #include <sysexits.h> 109 #include <unistd.h> 110 #include <utmpx.h> 111 112 #include "pathnames.h" 113 #include "ttymsg.h" 114 115 #define SYSLOG_NAMES 116 #include <sys/syslog.h> 117 118 const char *ConfFile = _PATH_LOGCONF; 119 const char *PidFile = _PATH_LOGPID; 120 const char ctty[] = _PATH_CONSOLE; 121 122 #define dprintf if (Debug) printf 123 124 #define MAXUNAMES 20 /* maximum number of user names */ 125 126 /* 127 * Unix sockets. 128 * We have two default sockets, one with 666 permissions, 129 * and one for privileged programs. 130 */ 131 struct funix { 132 int s; 133 const char *name; 134 mode_t mode; 135 STAILQ_ENTRY(funix) next; 136 }; 137 struct funix funix_secure = { -1, _PATH_LOG_PRIV, S_IRUSR | S_IWUSR, 138 { NULL } }; 139 struct funix funix_default = { -1, _PATH_LOG, DEFFILEMODE, 140 { &funix_secure } }; 141 142 STAILQ_HEAD(, funix) funixes = { &funix_default, 143 &(funix_secure.next.stqe_next) }; 144 145 /* 146 * Flags to logmsg(). 147 */ 148 149 #define IGN_CONS 0x001 /* don't print on console */ 150 #define SYNC_FILE 0x002 /* do fsync on file after printing */ 151 #define ADDDATE 0x004 /* add a date to the message */ 152 #define MARK 0x008 /* this message is a mark */ 153 #define ISKERNEL 0x010 /* kernel generated message */ 154 155 /* 156 * This structure represents the files that will have log 157 * copies printed. 158 * We require f_file to be valid if f_type is F_FILE, F_CONSOLE, F_TTY 159 * or if f_type if F_PIPE and f_pid > 0. 160 */ 161 162 struct filed { 163 struct filed *f_next; /* next in linked list */ 164 short f_type; /* entry type, see below */ 165 short f_file; /* file descriptor */ 166 time_t f_time; /* time this was last written */ 167 char *f_host; /* host from which to recd. */ 168 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 169 u_char f_pcmp[LOG_NFACILITIES+1]; /* compare priority */ 170 #define PRI_LT 0x1 171 #define PRI_EQ 0x2 172 #define PRI_GT 0x4 173 char *f_program; /* program this applies to */ 174 union { 175 char f_uname[MAXUNAMES][MAXLOGNAME]; 176 struct { 177 char f_hname[MAXHOSTNAMELEN]; 178 struct addrinfo *f_addr; 179 180 } f_forw; /* forwarding address */ 181 char f_fname[MAXPATHLEN]; 182 struct { 183 char f_pname[MAXPATHLEN]; 184 pid_t f_pid; 185 } f_pipe; 186 } f_un; 187 char f_prevline[MAXSVLINE]; /* last message logged */ 188 char f_lasttime[16]; /* time of last occurrence */ 189 char f_prevhost[MAXHOSTNAMELEN]; /* host from which recd. */ 190 int f_prevpri; /* pri of f_prevline */ 191 int f_prevlen; /* length of f_prevline */ 192 int f_prevcount; /* repetition cnt of prevline */ 193 u_int f_repeatcount; /* number of "repeated" msgs */ 194 int f_flags; /* file-specific flags */ 195 #define FFLAG_SYNC 0x01 196 #define FFLAG_NEEDSYNC 0x02 197 }; 198 199 /* 200 * Queue of about-to-be dead processes we should watch out for. 201 */ 202 203 TAILQ_HEAD(stailhead, deadq_entry) deadq_head; 204 struct stailhead *deadq_headp; 205 206 struct deadq_entry { 207 pid_t dq_pid; 208 int dq_timeout; 209 TAILQ_ENTRY(deadq_entry) dq_entries; 210 }; 211 212 /* 213 * The timeout to apply to processes waiting on the dead queue. Unit 214 * of measure is `mark intervals', i.e. 20 minutes by default. 215 * Processes on the dead queue will be terminated after that time. 216 */ 217 218 #define DQ_TIMO_INIT 2 219 220 typedef struct deadq_entry *dq_t; 221 222 223 /* 224 * Struct to hold records of network addresses that are allowed to log 225 * to us. 226 */ 227 struct allowedpeer { 228 int isnumeric; 229 u_short port; 230 union { 231 struct { 232 struct sockaddr_storage addr; 233 struct sockaddr_storage mask; 234 } numeric; 235 char *name; 236 } u; 237 #define a_addr u.numeric.addr 238 #define a_mask u.numeric.mask 239 #define a_name u.name 240 }; 241 242 243 /* 244 * Intervals at which we flush out "message repeated" messages, 245 * in seconds after previous message is logged. After each flush, 246 * we move to the next interval until we reach the largest. 247 */ 248 int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 249 #define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1) 250 #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 251 #define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \ 252 (f)->f_repeatcount = MAXREPEAT; \ 253 } 254 255 /* values for f_type */ 256 #define F_UNUSED 0 /* unused entry */ 257 #define F_FILE 1 /* regular file */ 258 #define F_TTY 2 /* terminal */ 259 #define F_CONSOLE 3 /* console terminal */ 260 #define F_FORW 4 /* remote machine */ 261 #define F_USERS 5 /* list of users */ 262 #define F_WALL 6 /* everyone logged on */ 263 #define F_PIPE 7 /* pipe to program */ 264 265 const char *TypeNames[8] = { 266 "UNUSED", "FILE", "TTY", "CONSOLE", 267 "FORW", "USERS", "WALL", "PIPE" 268 }; 269 270 static struct filed *Files; /* Log files that we write to */ 271 static struct filed consfile; /* Console */ 272 273 static int Debug; /* debug flag */ 274 static int resolve = 1; /* resolve hostname */ 275 static char LocalHostName[MAXHOSTNAMELEN]; /* our hostname */ 276 static const char *LocalDomain; /* our local domain name */ 277 static int *finet; /* Internet datagram socket */ 278 static int fklog = -1; /* /dev/klog */ 279 static int Initialized; /* set when we have initialized ourselves */ 280 static int MarkInterval = 20 * 60; /* interval between marks in seconds */ 281 static int MarkSeq; /* mark sequence number */ 282 static int NoBind; /* don't bind() as suggested by RFC 3164 */ 283 static int SecureMode; /* when true, receive only unix domain socks */ 284 #ifdef INET6 285 static int family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */ 286 #else 287 static int family = PF_INET; /* protocol family (IPv4 only) */ 288 #endif 289 static int mask_C1 = 1; /* mask characters from 0x80 - 0x9F */ 290 static int send_to_all; /* send message to all IPv4/IPv6 addresses */ 291 static int use_bootfile; /* log entire bootfile for every kern msg */ 292 static int no_compress; /* don't compress messages (1=pipes, 2=all) */ 293 static int logflags = O_WRONLY|O_APPEND; /* flags used to open log files */ 294 295 static char bootfile[MAXLINE+1]; /* booted kernel file */ 296 297 struct allowedpeer *AllowedPeers; /* List of allowed peers */ 298 static int NumAllowed; /* Number of entries in AllowedPeers */ 299 static int RemoteAddDate; /* Always set the date on remote messages */ 300 301 static int UniquePriority; /* Only log specified priority? */ 302 static int LogFacPri; /* Put facility and priority in log message: */ 303 /* 0=no, 1=numeric, 2=names */ 304 static int KeepKernFac; /* Keep remotely logged kernel facility */ 305 static int needdofsync = 0; /* Are any file(s) waiting to be fsynced? */ 306 static struct pidfh *pfh; 307 308 volatile sig_atomic_t MarkSet, WantDie; 309 310 static int allowaddr(char *); 311 static void cfline(const char *, struct filed *, 312 const char *, const char *); 313 static const char *cvthname(struct sockaddr *); 314 static void deadq_enter(pid_t, const char *); 315 static int deadq_remove(pid_t); 316 static int decode(const char *, const CODE *); 317 static void die(int); 318 static void dodie(int); 319 static void dofsync(void); 320 static void domark(int); 321 static void fprintlog(struct filed *, int, const char *); 322 static int *socksetup(int, char *); 323 static void init(int); 324 static void logerror(const char *); 325 static void logmsg(int, const char *, const char *, int); 326 static void log_deadchild(pid_t, int, const char *); 327 static void markit(void); 328 static int skip_message(const char *, const char *, int); 329 static void printline(const char *, char *, int); 330 static void printsys(char *); 331 static int p_open(const char *, pid_t *); 332 static void readklog(void); 333 static void reapchild(int); 334 static void usage(void); 335 static int validate(struct sockaddr *, const char *); 336 static void unmapped(struct sockaddr *); 337 static void wallmsg(struct filed *, struct iovec *, const int iovlen); 338 static int waitdaemon(int, int, int); 339 static void timedout(int); 340 static void increase_rcvbuf(int); 341 342 int 343 main(int argc, char *argv[]) 344 { 345 int ch, i, fdsrmax = 0, l; 346 struct sockaddr_un sunx, fromunix; 347 struct sockaddr_storage frominet; 348 fd_set *fdsr = NULL; 349 char line[MAXLINE + 1]; 350 char *bindhostname; 351 const char *hname; 352 struct timeval tv, *tvp; 353 struct sigaction sact; 354 struct funix *fx, *fx1; 355 sigset_t mask; 356 pid_t ppid = 1, spid; 357 socklen_t len; 358 359 if (madvise(NULL, 0, MADV_PROTECT) != 0) 360 dprintf("madvise() failed: %s\n", strerror(errno)); 361 362 bindhostname = NULL; 363 while ((ch = getopt(argc, argv, "468Aa:b:cCdf:kl:m:nNop:P:sS:Tuv")) 364 != -1) 365 switch (ch) { 366 case '4': 367 family = PF_INET; 368 break; 369 #ifdef INET6 370 case '6': 371 family = PF_INET6; 372 break; 373 #endif 374 case '8': 375 mask_C1 = 0; 376 break; 377 case 'A': 378 send_to_all++; 379 break; 380 case 'a': /* allow specific network addresses only */ 381 if (allowaddr(optarg) == -1) 382 usage(); 383 break; 384 case 'b': 385 bindhostname = optarg; 386 break; 387 case 'c': 388 no_compress++; 389 break; 390 case 'C': 391 logflags |= O_CREAT; 392 break; 393 case 'd': /* debug */ 394 Debug++; 395 break; 396 case 'f': /* configuration file */ 397 ConfFile = optarg; 398 break; 399 case 'k': /* keep remote kern fac */ 400 KeepKernFac = 1; 401 break; 402 case 'l': 403 { 404 long perml; 405 mode_t mode; 406 char *name, *ep; 407 408 if (optarg[0] == '/') { 409 mode = DEFFILEMODE; 410 name = optarg; 411 } else if ((name = strchr(optarg, ':')) != NULL) { 412 *name++ = '\0'; 413 if (name[0] != '/') 414 errx(1, "socket name must be absolute " 415 "path"); 416 if (isdigit(*optarg)) { 417 perml = strtol(optarg, &ep, 8); 418 if (*ep || perml < 0 || 419 perml & ~(S_IRWXU|S_IRWXG|S_IRWXO)) 420 errx(1, "invalid mode %s, exiting", 421 optarg); 422 mode = (mode_t )perml; 423 } else 424 errx(1, "invalid mode %s, exiting", 425 optarg); 426 } else /* doesn't begin with '/', and no ':' */ 427 errx(1, "can't parse path %s", optarg); 428 429 if (strlen(name) >= sizeof(sunx.sun_path)) 430 errx(1, "%s path too long, exiting", name); 431 if ((fx = malloc(sizeof(struct funix))) == NULL) 432 errx(1, "malloc failed"); 433 fx->s = -1; 434 fx->name = name; 435 fx->mode = mode; 436 STAILQ_INSERT_TAIL(&funixes, fx, next); 437 break; 438 } 439 case 'm': /* mark interval */ 440 MarkInterval = atoi(optarg) * 60; 441 break; 442 case 'N': 443 NoBind = 1; 444 SecureMode = 1; 445 break; 446 case 'n': 447 resolve = 0; 448 break; 449 case 'o': 450 use_bootfile = 1; 451 break; 452 case 'p': /* path */ 453 if (strlen(optarg) >= sizeof(sunx.sun_path)) 454 errx(1, "%s path too long, exiting", optarg); 455 funix_default.name = optarg; 456 break; 457 case 'P': /* path for alt. PID */ 458 PidFile = optarg; 459 break; 460 case 's': /* no network mode */ 461 SecureMode++; 462 break; 463 case 'S': /* path for privileged originator */ 464 if (strlen(optarg) >= sizeof(sunx.sun_path)) 465 errx(1, "%s path too long, exiting", optarg); 466 funix_secure.name = optarg; 467 break; 468 case 'T': 469 RemoteAddDate = 1; 470 break; 471 case 'u': /* only log specified priority */ 472 UniquePriority++; 473 break; 474 case 'v': /* log facility and priority */ 475 LogFacPri++; 476 break; 477 default: 478 usage(); 479 } 480 if ((argc -= optind) != 0) 481 usage(); 482 483 pfh = pidfile_open(PidFile, 0600, &spid); 484 if (pfh == NULL) { 485 if (errno == EEXIST) 486 errx(1, "syslogd already running, pid: %d", spid); 487 warn("cannot open pid file"); 488 } 489 490 if (!Debug) { 491 ppid = waitdaemon(0, 0, 30); 492 if (ppid < 0) { 493 warn("could not become daemon"); 494 pidfile_remove(pfh); 495 exit(1); 496 } 497 } else { 498 setlinebuf(stdout); 499 } 500 501 if (NumAllowed) 502 endservent(); 503 504 consfile.f_type = F_CONSOLE; 505 (void)strlcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1, 506 sizeof(consfile.f_un.f_fname)); 507 (void)strlcpy(bootfile, getbootfile(), sizeof(bootfile)); 508 (void)signal(SIGTERM, dodie); 509 (void)signal(SIGINT, Debug ? dodie : SIG_IGN); 510 (void)signal(SIGQUIT, Debug ? dodie : SIG_IGN); 511 /* 512 * We don't want the SIGCHLD and SIGHUP handlers to interfere 513 * with each other; they are likely candidates for being called 514 * simultaneously (SIGHUP closes pipe descriptor, process dies, 515 * SIGCHLD happens). 516 */ 517 sigemptyset(&mask); 518 sigaddset(&mask, SIGHUP); 519 sact.sa_handler = reapchild; 520 sact.sa_mask = mask; 521 sact.sa_flags = SA_RESTART; 522 (void)sigaction(SIGCHLD, &sact, NULL); 523 (void)signal(SIGALRM, domark); 524 (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */ 525 (void)alarm(TIMERINTVL); 526 527 TAILQ_INIT(&deadq_head); 528 529 #ifndef SUN_LEN 530 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2) 531 #endif 532 STAILQ_FOREACH_SAFE(fx, &funixes, next, fx1) { 533 (void)unlink(fx->name); 534 memset(&sunx, 0, sizeof(sunx)); 535 sunx.sun_family = AF_LOCAL; 536 (void)strlcpy(sunx.sun_path, fx->name, sizeof(sunx.sun_path)); 537 fx->s = socket(PF_LOCAL, SOCK_DGRAM, 0); 538 if (fx->s < 0 || 539 bind(fx->s, (struct sockaddr *)&sunx, SUN_LEN(&sunx)) < 0 || 540 chmod(fx->name, fx->mode) < 0) { 541 (void)snprintf(line, sizeof line, 542 "cannot create %s", fx->name); 543 logerror(line); 544 dprintf("cannot create %s (%d)\n", fx->name, errno); 545 if (fx == &funix_default || fx == &funix_secure) 546 die(0); 547 else { 548 STAILQ_REMOVE(&funixes, fx, funix, next); 549 continue; 550 } 551 } 552 increase_rcvbuf(fx->s); 553 } 554 if (SecureMode <= 1) 555 finet = socksetup(family, bindhostname); 556 557 if (finet) { 558 if (SecureMode) { 559 for (i = 0; i < *finet; i++) { 560 if (shutdown(finet[i+1], SHUT_RD) < 0 && 561 errno != ENOTCONN) { 562 logerror("shutdown"); 563 if (!Debug) 564 die(0); 565 } 566 } 567 } else { 568 dprintf("listening on inet and/or inet6 socket\n"); 569 } 570 dprintf("sending on inet and/or inet6 socket\n"); 571 } 572 573 if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0) 574 if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0) 575 fklog = -1; 576 if (fklog < 0) 577 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 578 579 /* tuck my process id away */ 580 pidfile_write(pfh); 581 582 dprintf("off & running....\n"); 583 584 init(0); 585 /* prevent SIGHUP and SIGCHLD handlers from running in parallel */ 586 sigemptyset(&mask); 587 sigaddset(&mask, SIGCHLD); 588 sact.sa_handler = init; 589 sact.sa_mask = mask; 590 sact.sa_flags = SA_RESTART; 591 (void)sigaction(SIGHUP, &sact, NULL); 592 593 tvp = &tv; 594 tv.tv_sec = tv.tv_usec = 0; 595 596 if (fklog != -1 && fklog > fdsrmax) 597 fdsrmax = fklog; 598 if (finet && !SecureMode) { 599 for (i = 0; i < *finet; i++) { 600 if (finet[i+1] != -1 && finet[i+1] > fdsrmax) 601 fdsrmax = finet[i+1]; 602 } 603 } 604 STAILQ_FOREACH(fx, &funixes, next) 605 if (fx->s > fdsrmax) 606 fdsrmax = fx->s; 607 608 fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS), 609 sizeof(fd_mask)); 610 if (fdsr == NULL) 611 errx(1, "calloc fd_set"); 612 613 for (;;) { 614 if (MarkSet) 615 markit(); 616 if (WantDie) 617 die(WantDie); 618 619 bzero(fdsr, howmany(fdsrmax+1, NFDBITS) * 620 sizeof(fd_mask)); 621 622 if (fklog != -1) 623 FD_SET(fklog, fdsr); 624 if (finet && !SecureMode) { 625 for (i = 0; i < *finet; i++) { 626 if (finet[i+1] != -1) 627 FD_SET(finet[i+1], fdsr); 628 } 629 } 630 STAILQ_FOREACH(fx, &funixes, next) 631 FD_SET(fx->s, fdsr); 632 633 i = select(fdsrmax+1, fdsr, NULL, NULL, 634 needdofsync ? &tv : tvp); 635 switch (i) { 636 case 0: 637 dofsync(); 638 needdofsync = 0; 639 if (tvp) { 640 tvp = NULL; 641 if (ppid != 1) 642 kill(ppid, SIGALRM); 643 } 644 continue; 645 case -1: 646 if (errno != EINTR) 647 logerror("select"); 648 continue; 649 } 650 if (fklog != -1 && FD_ISSET(fklog, fdsr)) 651 readklog(); 652 if (finet && !SecureMode) { 653 for (i = 0; i < *finet; i++) { 654 if (FD_ISSET(finet[i+1], fdsr)) { 655 len = sizeof(frominet); 656 l = recvfrom(finet[i+1], line, MAXLINE, 657 0, (struct sockaddr *)&frominet, 658 &len); 659 if (l > 0) { 660 line[l] = '\0'; 661 hname = cvthname((struct sockaddr *)&frominet); 662 unmapped((struct sockaddr *)&frominet); 663 if (validate((struct sockaddr *)&frominet, hname)) 664 printline(hname, line, RemoteAddDate ? ADDDATE : 0); 665 } else if (l < 0 && errno != EINTR) 666 logerror("recvfrom inet"); 667 } 668 } 669 } 670 STAILQ_FOREACH(fx, &funixes, next) { 671 if (FD_ISSET(fx->s, fdsr)) { 672 len = sizeof(fromunix); 673 l = recvfrom(fx->s, line, MAXLINE, 0, 674 (struct sockaddr *)&fromunix, &len); 675 if (l > 0) { 676 line[l] = '\0'; 677 printline(LocalHostName, line, 0); 678 } else if (l < 0 && errno != EINTR) 679 logerror("recvfrom unix"); 680 } 681 } 682 } 683 if (fdsr) 684 free(fdsr); 685 } 686 687 static void 688 unmapped(struct sockaddr *sa) 689 { 690 struct sockaddr_in6 *sin6; 691 struct sockaddr_in sin4; 692 693 if (sa->sa_family != AF_INET6) 694 return; 695 if (sa->sa_len != sizeof(struct sockaddr_in6) || 696 sizeof(sin4) > sa->sa_len) 697 return; 698 sin6 = (struct sockaddr_in6 *)sa; 699 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 700 return; 701 702 memset(&sin4, 0, sizeof(sin4)); 703 sin4.sin_family = AF_INET; 704 sin4.sin_len = sizeof(struct sockaddr_in); 705 memcpy(&sin4.sin_addr, &sin6->sin6_addr.s6_addr[12], 706 sizeof(sin4.sin_addr)); 707 sin4.sin_port = sin6->sin6_port; 708 709 memcpy(sa, &sin4, sin4.sin_len); 710 } 711 712 static void 713 usage(void) 714 { 715 716 fprintf(stderr, "%s\n%s\n%s\n%s\n", 717 "usage: syslogd [-468ACcdknosTuv] [-a allowed_peer]", 718 " [-b bind_address] [-f config_file]", 719 " [-l [mode:]path] [-m mark_interval]", 720 " [-P pid_file] [-p log_socket]"); 721 exit(1); 722 } 723 724 /* 725 * Take a raw input line, decode the message, and print the message 726 * on the appropriate log files. 727 */ 728 static void 729 printline(const char *hname, char *msg, int flags) 730 { 731 char *p, *q; 732 long n; 733 int c, pri; 734 char line[MAXLINE + 1]; 735 736 /* test for special codes */ 737 p = msg; 738 pri = DEFUPRI; 739 if (*p == '<') { 740 errno = 0; 741 n = strtol(p + 1, &q, 10); 742 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 743 p = q + 1; 744 pri = n; 745 } 746 } 747 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 748 pri = DEFUPRI; 749 750 /* 751 * Don't allow users to log kernel messages. 752 * NOTE: since LOG_KERN == 0 this will also match 753 * messages with no facility specified. 754 */ 755 if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac) 756 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 757 758 q = line; 759 760 while ((c = (unsigned char)*p++) != '\0' && 761 q < &line[sizeof(line) - 4]) { 762 if (mask_C1 && (c & 0x80) && c < 0xA0) { 763 c &= 0x7F; 764 *q++ = 'M'; 765 *q++ = '-'; 766 } 767 if (isascii(c) && iscntrl(c)) { 768 if (c == '\n') { 769 *q++ = ' '; 770 } else if (c == '\t') { 771 *q++ = '\t'; 772 } else { 773 *q++ = '^'; 774 *q++ = c ^ 0100; 775 } 776 } else { 777 *q++ = c; 778 } 779 } 780 *q = '\0'; 781 782 logmsg(pri, line, hname, flags); 783 } 784 785 /* 786 * Read /dev/klog while data are available, split into lines. 787 */ 788 static void 789 readklog(void) 790 { 791 char *p, *q, line[MAXLINE + 1]; 792 int len, i; 793 794 len = 0; 795 for (;;) { 796 i = read(fklog, line + len, MAXLINE - 1 - len); 797 if (i > 0) { 798 line[i + len] = '\0'; 799 } else { 800 if (i < 0 && errno != EINTR && errno != EAGAIN) { 801 logerror("klog"); 802 fklog = -1; 803 } 804 break; 805 } 806 807 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) { 808 *q = '\0'; 809 printsys(p); 810 } 811 len = strlen(p); 812 if (len >= MAXLINE - 1) { 813 printsys(p); 814 len = 0; 815 } 816 if (len > 0) 817 memmove(line, p, len + 1); 818 } 819 if (len > 0) 820 printsys(line); 821 } 822 823 /* 824 * Take a raw input line from /dev/klog, format similar to syslog(). 825 */ 826 static void 827 printsys(char *msg) 828 { 829 char *p, *q; 830 long n; 831 int flags, isprintf, pri; 832 833 flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */ 834 p = msg; 835 pri = DEFSPRI; 836 isprintf = 1; 837 if (*p == '<') { 838 errno = 0; 839 n = strtol(p + 1, &q, 10); 840 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 841 p = q + 1; 842 pri = n; 843 isprintf = 0; 844 } 845 } 846 /* 847 * Kernel printf's and LOG_CONSOLE messages have been displayed 848 * on the console already. 849 */ 850 if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE) 851 flags |= IGN_CONS; 852 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 853 pri = DEFSPRI; 854 logmsg(pri, p, LocalHostName, flags); 855 } 856 857 static time_t now; 858 859 /* 860 * Match a program or host name against a specification. 861 * Return a non-0 value if the message must be ignored 862 * based on the specification. 863 */ 864 static int 865 skip_message(const char *name, const char *spec, int checkcase) 866 { 867 const char *s; 868 char prev, next; 869 int exclude = 0; 870 /* Behaviour on explicit match */ 871 872 if (spec == NULL) 873 return 0; 874 switch (*spec) { 875 case '-': 876 exclude = 1; 877 /*FALLTHROUGH*/ 878 case '+': 879 spec++; 880 break; 881 default: 882 break; 883 } 884 if (checkcase) 885 s = strstr (spec, name); 886 else 887 s = strcasestr (spec, name); 888 889 if (s != NULL) { 890 prev = (s == spec ? ',' : *(s - 1)); 891 next = *(s + strlen (name)); 892 893 if (prev == ',' && (next == '\0' || next == ',')) 894 /* Explicit match: skip iff the spec is an 895 exclusive one. */ 896 return exclude; 897 } 898 899 /* No explicit match for this name: skip the message iff 900 the spec is an inclusive one. */ 901 return !exclude; 902 } 903 904 /* 905 * Log a message to the appropriate log files, users, etc. based on 906 * the priority. 907 */ 908 static void 909 logmsg(int pri, const char *msg, const char *from, int flags) 910 { 911 struct filed *f; 912 int i, fac, msglen, omask, prilev; 913 const char *timestamp; 914 char prog[NAME_MAX+1]; 915 char buf[MAXLINE+1]; 916 917 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 918 pri, flags, from, msg); 919 920 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 921 922 /* 923 * Check to see if msg looks non-standard. 924 */ 925 msglen = strlen(msg); 926 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || 927 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 928 flags |= ADDDATE; 929 930 (void)time(&now); 931 if (flags & ADDDATE) { 932 timestamp = ctime(&now) + 4; 933 } else { 934 timestamp = msg; 935 msg += 16; 936 msglen -= 16; 937 } 938 939 /* skip leading blanks */ 940 while (isspace(*msg)) { 941 msg++; 942 msglen--; 943 } 944 945 /* extract facility and priority level */ 946 if (flags & MARK) 947 fac = LOG_NFACILITIES; 948 else 949 fac = LOG_FAC(pri); 950 951 /* Check maximum facility number. */ 952 if (fac > LOG_NFACILITIES) { 953 (void)sigsetmask(omask); 954 return; 955 } 956 957 prilev = LOG_PRI(pri); 958 959 /* extract program name */ 960 for (i = 0; i < NAME_MAX; i++) { 961 if (!isprint(msg[i]) || msg[i] == ':' || msg[i] == '[' || 962 msg[i] == '/' || isspace(msg[i])) 963 break; 964 prog[i] = msg[i]; 965 } 966 prog[i] = 0; 967 968 /* add kernel prefix for kernel messages */ 969 if (flags & ISKERNEL) { 970 snprintf(buf, sizeof(buf), "%s: %s", 971 use_bootfile ? bootfile : "kernel", msg); 972 msg = buf; 973 msglen = strlen(buf); 974 } 975 976 /* log the message to the particular outputs */ 977 if (!Initialized) { 978 f = &consfile; 979 /* 980 * Open in non-blocking mode to avoid hangs during open 981 * and close(waiting for the port to drain). 982 */ 983 f->f_file = open(ctty, O_WRONLY | O_NONBLOCK, 0); 984 985 if (f->f_file >= 0) { 986 (void)strlcpy(f->f_lasttime, timestamp, 987 sizeof(f->f_lasttime)); 988 fprintlog(f, flags, msg); 989 (void)close(f->f_file); 990 } 991 (void)sigsetmask(omask); 992 return; 993 } 994 for (f = Files; f; f = f->f_next) { 995 /* skip messages that are incorrect priority */ 996 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 997 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 998 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 999 ) 1000 || f->f_pmask[fac] == INTERNAL_NOPRI) 1001 continue; 1002 1003 /* skip messages with the incorrect hostname */ 1004 if (skip_message(from, f->f_host, 0)) 1005 continue; 1006 1007 /* skip messages with the incorrect program name */ 1008 if (skip_message(prog, f->f_program, 1)) 1009 continue; 1010 1011 /* skip message to console if it has already been printed */ 1012 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 1013 continue; 1014 1015 /* don't output marks to recently written files */ 1016 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 1017 continue; 1018 1019 /* 1020 * suppress duplicate lines to this file 1021 */ 1022 if (no_compress - (f->f_type != F_PIPE) < 1 && 1023 (flags & MARK) == 0 && msglen == f->f_prevlen && 1024 !strcmp(msg, f->f_prevline) && 1025 !strcasecmp(from, f->f_prevhost)) { 1026 (void)strlcpy(f->f_lasttime, timestamp, 1027 sizeof(f->f_lasttime)); 1028 f->f_prevcount++; 1029 dprintf("msg repeated %d times, %ld sec of %d\n", 1030 f->f_prevcount, (long)(now - f->f_time), 1031 repeatinterval[f->f_repeatcount]); 1032 /* 1033 * If domark would have logged this by now, 1034 * flush it now (so we don't hold isolated messages), 1035 * but back off so we'll flush less often 1036 * in the future. 1037 */ 1038 if (now > REPEATTIME(f)) { 1039 fprintlog(f, flags, (char *)NULL); 1040 BACKOFF(f); 1041 } 1042 } else { 1043 /* new line, save it */ 1044 if (f->f_prevcount) 1045 fprintlog(f, 0, (char *)NULL); 1046 f->f_repeatcount = 0; 1047 f->f_prevpri = pri; 1048 (void)strlcpy(f->f_lasttime, timestamp, 1049 sizeof(f->f_lasttime)); 1050 (void)strlcpy(f->f_prevhost, from, 1051 sizeof(f->f_prevhost)); 1052 if (msglen < MAXSVLINE) { 1053 f->f_prevlen = msglen; 1054 (void)strlcpy(f->f_prevline, msg, sizeof(f->f_prevline)); 1055 fprintlog(f, flags, (char *)NULL); 1056 } else { 1057 f->f_prevline[0] = 0; 1058 f->f_prevlen = 0; 1059 fprintlog(f, flags, msg); 1060 } 1061 } 1062 } 1063 (void)sigsetmask(omask); 1064 } 1065 1066 static void 1067 dofsync(void) 1068 { 1069 struct filed *f; 1070 1071 for (f = Files; f; f = f->f_next) { 1072 if ((f->f_type == F_FILE) && 1073 (f->f_flags & FFLAG_NEEDSYNC)) { 1074 f->f_flags &= ~FFLAG_NEEDSYNC; 1075 (void)fsync(f->f_file); 1076 } 1077 } 1078 } 1079 1080 #define IOV_SIZE 7 1081 static void 1082 fprintlog(struct filed *f, int flags, const char *msg) 1083 { 1084 struct iovec iov[IOV_SIZE]; 1085 struct iovec *v; 1086 struct addrinfo *r; 1087 int i, l, lsent = 0; 1088 char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL; 1089 char nul[] = "", space[] = " ", lf[] = "\n", crlf[] = "\r\n"; 1090 const char *msgret; 1091 1092 v = iov; 1093 if (f->f_type == F_WALL) { 1094 v->iov_base = greetings; 1095 /* The time displayed is not synchornized with the other log 1096 * destinations (like messages). Following fragment was using 1097 * ctime(&now), which was updating the time every 30 sec. 1098 * With f_lasttime, time is synchronized correctly. 1099 */ 1100 v->iov_len = snprintf(greetings, sizeof greetings, 1101 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 1102 f->f_prevhost, f->f_lasttime); 1103 if (v->iov_len >= sizeof greetings) 1104 v->iov_len = sizeof greetings - 1; 1105 v++; 1106 v->iov_base = nul; 1107 v->iov_len = 0; 1108 v++; 1109 } else { 1110 v->iov_base = f->f_lasttime; 1111 v->iov_len = strlen(f->f_lasttime); 1112 v++; 1113 v->iov_base = space; 1114 v->iov_len = 1; 1115 v++; 1116 } 1117 1118 if (LogFacPri) { 1119 static char fp_buf[30]; /* Hollow laugh */ 1120 int fac = f->f_prevpri & LOG_FACMASK; 1121 int pri = LOG_PRI(f->f_prevpri); 1122 const char *f_s = NULL; 1123 char f_n[5]; /* Hollow laugh */ 1124 const char *p_s = NULL; 1125 char p_n[5]; /* Hollow laugh */ 1126 1127 if (LogFacPri > 1) { 1128 const CODE *c; 1129 1130 for (c = facilitynames; c->c_name; c++) { 1131 if (c->c_val == fac) { 1132 f_s = c->c_name; 1133 break; 1134 } 1135 } 1136 for (c = prioritynames; c->c_name; c++) { 1137 if (c->c_val == pri) { 1138 p_s = c->c_name; 1139 break; 1140 } 1141 } 1142 } 1143 if (!f_s) { 1144 snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac)); 1145 f_s = f_n; 1146 } 1147 if (!p_s) { 1148 snprintf(p_n, sizeof p_n, "%d", pri); 1149 p_s = p_n; 1150 } 1151 snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s); 1152 v->iov_base = fp_buf; 1153 v->iov_len = strlen(fp_buf); 1154 } else { 1155 v->iov_base = nul; 1156 v->iov_len = 0; 1157 } 1158 v++; 1159 1160 v->iov_base = f->f_prevhost; 1161 v->iov_len = strlen(v->iov_base); 1162 v++; 1163 v->iov_base = space; 1164 v->iov_len = 1; 1165 v++; 1166 1167 if (msg) { 1168 wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */ 1169 if (wmsg == NULL) { 1170 logerror("strdup"); 1171 exit(1); 1172 } 1173 v->iov_base = wmsg; 1174 v->iov_len = strlen(msg); 1175 } else if (f->f_prevcount > 1) { 1176 v->iov_base = repbuf; 1177 v->iov_len = snprintf(repbuf, sizeof repbuf, 1178 "last message repeated %d times", f->f_prevcount); 1179 } else { 1180 v->iov_base = f->f_prevline; 1181 v->iov_len = f->f_prevlen; 1182 } 1183 v++; 1184 1185 dprintf("Logging to %s", TypeNames[f->f_type]); 1186 f->f_time = now; 1187 1188 switch (f->f_type) { 1189 int port; 1190 case F_UNUSED: 1191 dprintf("\n"); 1192 break; 1193 1194 case F_FORW: 1195 port = (int)ntohs(((struct sockaddr_in *) 1196 (f->f_un.f_forw.f_addr->ai_addr))->sin_port); 1197 if (port != 514) { 1198 dprintf(" %s:%d\n", f->f_un.f_forw.f_hname, port); 1199 } else { 1200 dprintf(" %s\n", f->f_un.f_forw.f_hname); 1201 } 1202 /* check for local vs remote messages */ 1203 if (strcasecmp(f->f_prevhost, LocalHostName)) 1204 l = snprintf(line, sizeof line - 1, 1205 "<%d>%.15s Forwarded from %s: %s", 1206 f->f_prevpri, (char *)iov[0].iov_base, 1207 f->f_prevhost, (char *)iov[5].iov_base); 1208 else 1209 l = snprintf(line, sizeof line - 1, "<%d>%.15s %s", 1210 f->f_prevpri, (char *)iov[0].iov_base, 1211 (char *)iov[5].iov_base); 1212 if (l < 0) 1213 l = 0; 1214 else if (l > MAXLINE) 1215 l = MAXLINE; 1216 1217 if (finet) { 1218 for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) { 1219 for (i = 0; i < *finet; i++) { 1220 #if 0 1221 /* 1222 * should we check AF first, or just 1223 * trial and error? FWD 1224 */ 1225 if (r->ai_family == 1226 address_family_of(finet[i+1])) 1227 #endif 1228 lsent = sendto(finet[i+1], line, l, 0, 1229 r->ai_addr, r->ai_addrlen); 1230 if (lsent == l) 1231 break; 1232 } 1233 if (lsent == l && !send_to_all) 1234 break; 1235 } 1236 dprintf("lsent/l: %d/%d\n", lsent, l); 1237 if (lsent != l) { 1238 int e = errno; 1239 logerror("sendto"); 1240 errno = e; 1241 switch (errno) { 1242 case ENOBUFS: 1243 case ENETDOWN: 1244 case ENETUNREACH: 1245 case EHOSTUNREACH: 1246 case EHOSTDOWN: 1247 case EADDRNOTAVAIL: 1248 break; 1249 /* case EBADF: */ 1250 /* case EACCES: */ 1251 /* case ENOTSOCK: */ 1252 /* case EFAULT: */ 1253 /* case EMSGSIZE: */ 1254 /* case EAGAIN: */ 1255 /* case ENOBUFS: */ 1256 /* case ECONNREFUSED: */ 1257 default: 1258 dprintf("removing entry: errno=%d\n", e); 1259 f->f_type = F_UNUSED; 1260 break; 1261 } 1262 } 1263 } 1264 break; 1265 1266 case F_FILE: 1267 dprintf(" %s\n", f->f_un.f_fname); 1268 v->iov_base = lf; 1269 v->iov_len = 1; 1270 if (writev(f->f_file, iov, IOV_SIZE) < 0) { 1271 /* 1272 * If writev(2) fails for potentially transient errors 1273 * like the filesystem being full, ignore it. 1274 * Otherwise remove this logfile from the list. 1275 */ 1276 if (errno != ENOSPC) { 1277 int e = errno; 1278 (void)close(f->f_file); 1279 f->f_type = F_UNUSED; 1280 errno = e; 1281 logerror(f->f_un.f_fname); 1282 } 1283 } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) { 1284 f->f_flags |= FFLAG_NEEDSYNC; 1285 needdofsync = 1; 1286 } 1287 break; 1288 1289 case F_PIPE: 1290 dprintf(" %s\n", f->f_un.f_pipe.f_pname); 1291 v->iov_base = lf; 1292 v->iov_len = 1; 1293 if (f->f_un.f_pipe.f_pid == 0) { 1294 if ((f->f_file = p_open(f->f_un.f_pipe.f_pname, 1295 &f->f_un.f_pipe.f_pid)) < 0) { 1296 f->f_type = F_UNUSED; 1297 logerror(f->f_un.f_pipe.f_pname); 1298 break; 1299 } 1300 } 1301 if (writev(f->f_file, iov, IOV_SIZE) < 0) { 1302 int e = errno; 1303 (void)close(f->f_file); 1304 if (f->f_un.f_pipe.f_pid > 0) 1305 deadq_enter(f->f_un.f_pipe.f_pid, 1306 f->f_un.f_pipe.f_pname); 1307 f->f_un.f_pipe.f_pid = 0; 1308 errno = e; 1309 logerror(f->f_un.f_pipe.f_pname); 1310 } 1311 break; 1312 1313 case F_CONSOLE: 1314 if (flags & IGN_CONS) { 1315 dprintf(" (ignored)\n"); 1316 break; 1317 } 1318 /* FALLTHROUGH */ 1319 1320 case F_TTY: 1321 dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname); 1322 v->iov_base = crlf; 1323 v->iov_len = 2; 1324 1325 errno = 0; /* ttymsg() only sometimes returns an errno */ 1326 if ((msgret = ttymsg(iov, IOV_SIZE, f->f_un.f_fname, 10))) { 1327 f->f_type = F_UNUSED; 1328 logerror(msgret); 1329 } 1330 break; 1331 1332 case F_USERS: 1333 case F_WALL: 1334 dprintf("\n"); 1335 v->iov_base = crlf; 1336 v->iov_len = 2; 1337 wallmsg(f, iov, IOV_SIZE); 1338 break; 1339 } 1340 f->f_prevcount = 0; 1341 free(wmsg); 1342 } 1343 1344 /* 1345 * WALLMSG -- Write a message to the world at large 1346 * 1347 * Write the specified message to either the entire 1348 * world, or a list of approved users. 1349 */ 1350 static void 1351 wallmsg(struct filed *f, struct iovec *iov, const int iovlen) 1352 { 1353 static int reenter; /* avoid calling ourselves */ 1354 struct utmpx *ut; 1355 int i; 1356 const char *p; 1357 1358 if (reenter++) 1359 return; 1360 setutxent(); 1361 /* NOSTRICT */ 1362 while ((ut = getutxent()) != NULL) { 1363 if (ut->ut_type != USER_PROCESS) 1364 continue; 1365 if (f->f_type == F_WALL) { 1366 if ((p = ttymsg(iov, iovlen, ut->ut_line, 1367 TTYMSGTIME)) != NULL) { 1368 errno = 0; /* already in msg */ 1369 logerror(p); 1370 } 1371 continue; 1372 } 1373 /* should we send the message to this user? */ 1374 for (i = 0; i < MAXUNAMES; i++) { 1375 if (!f->f_un.f_uname[i][0]) 1376 break; 1377 if (!strcmp(f->f_un.f_uname[i], ut->ut_user)) { 1378 if ((p = ttymsg(iov, iovlen, ut->ut_line, 1379 TTYMSGTIME)) != NULL) { 1380 errno = 0; /* already in msg */ 1381 logerror(p); 1382 } 1383 break; 1384 } 1385 } 1386 } 1387 endutxent(); 1388 reenter = 0; 1389 } 1390 1391 static void 1392 reapchild(int signo __unused) 1393 { 1394 int status; 1395 pid_t pid; 1396 struct filed *f; 1397 1398 while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { 1399 if (!Initialized) 1400 /* Don't tell while we are initting. */ 1401 continue; 1402 1403 /* First, look if it's a process from the dead queue. */ 1404 if (deadq_remove(pid)) 1405 goto oncemore; 1406 1407 /* Now, look in list of active processes. */ 1408 for (f = Files; f; f = f->f_next) 1409 if (f->f_type == F_PIPE && 1410 f->f_un.f_pipe.f_pid == pid) { 1411 (void)close(f->f_file); 1412 f->f_un.f_pipe.f_pid = 0; 1413 log_deadchild(pid, status, 1414 f->f_un.f_pipe.f_pname); 1415 break; 1416 } 1417 oncemore: 1418 continue; 1419 } 1420 } 1421 1422 /* 1423 * Return a printable representation of a host address. 1424 */ 1425 static const char * 1426 cvthname(struct sockaddr *f) 1427 { 1428 int error, hl; 1429 sigset_t omask, nmask; 1430 static char hname[NI_MAXHOST], ip[NI_MAXHOST]; 1431 1432 error = getnameinfo((struct sockaddr *)f, 1433 ((struct sockaddr *)f)->sa_len, 1434 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 1435 dprintf("cvthname(%s)\n", ip); 1436 1437 if (error) { 1438 dprintf("Malformed from address %s\n", gai_strerror(error)); 1439 return ("???"); 1440 } 1441 if (!resolve) 1442 return (ip); 1443 1444 sigemptyset(&nmask); 1445 sigaddset(&nmask, SIGHUP); 1446 sigprocmask(SIG_BLOCK, &nmask, &omask); 1447 error = getnameinfo((struct sockaddr *)f, 1448 ((struct sockaddr *)f)->sa_len, 1449 hname, sizeof hname, NULL, 0, NI_NAMEREQD); 1450 sigprocmask(SIG_SETMASK, &omask, NULL); 1451 if (error) { 1452 dprintf("Host name for your address (%s) unknown\n", ip); 1453 return (ip); 1454 } 1455 hl = strlen(hname); 1456 if (hl > 0 && hname[hl-1] == '.') 1457 hname[--hl] = '\0'; 1458 trimdomain(hname, hl); 1459 return (hname); 1460 } 1461 1462 static void 1463 dodie(int signo) 1464 { 1465 1466 WantDie = signo; 1467 } 1468 1469 static void 1470 domark(int signo __unused) 1471 { 1472 1473 MarkSet = 1; 1474 } 1475 1476 /* 1477 * Print syslogd errors some place. 1478 */ 1479 static void 1480 logerror(const char *type) 1481 { 1482 char buf[512]; 1483 static int recursed = 0; 1484 1485 /* If there's an error while trying to log an error, give up. */ 1486 if (recursed) 1487 return; 1488 recursed++; 1489 if (errno) 1490 (void)snprintf(buf, 1491 sizeof buf, "syslogd: %s: %s", type, strerror(errno)); 1492 else 1493 (void)snprintf(buf, sizeof buf, "syslogd: %s", type); 1494 errno = 0; 1495 dprintf("%s\n", buf); 1496 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1497 recursed--; 1498 } 1499 1500 static void 1501 die(int signo) 1502 { 1503 struct filed *f; 1504 struct funix *fx; 1505 int was_initialized; 1506 char buf[100]; 1507 1508 was_initialized = Initialized; 1509 Initialized = 0; /* Don't log SIGCHLDs. */ 1510 for (f = Files; f != NULL; f = f->f_next) { 1511 /* flush any pending output */ 1512 if (f->f_prevcount) 1513 fprintlog(f, 0, (char *)NULL); 1514 if (f->f_type == F_PIPE && f->f_un.f_pipe.f_pid > 0) { 1515 (void)close(f->f_file); 1516 f->f_un.f_pipe.f_pid = 0; 1517 } 1518 } 1519 Initialized = was_initialized; 1520 if (signo) { 1521 dprintf("syslogd: exiting on signal %d\n", signo); 1522 (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo); 1523 errno = 0; 1524 logerror(buf); 1525 } 1526 STAILQ_FOREACH(fx, &funixes, next) 1527 (void)unlink(fx->name); 1528 pidfile_remove(pfh); 1529 1530 exit(1); 1531 } 1532 1533 /* 1534 * INIT -- Initialize syslogd from configuration table 1535 */ 1536 static void 1537 init(int signo) 1538 { 1539 int i; 1540 FILE *cf; 1541 struct filed *f, *next, **nextp; 1542 char *p; 1543 char cline[LINE_MAX]; 1544 char prog[LINE_MAX]; 1545 char host[MAXHOSTNAMELEN]; 1546 char oldLocalHostName[MAXHOSTNAMELEN]; 1547 char hostMsg[2*MAXHOSTNAMELEN+40]; 1548 char bootfileMsg[LINE_MAX]; 1549 1550 dprintf("init\n"); 1551 1552 /* 1553 * Load hostname (may have changed). 1554 */ 1555 if (signo != 0) 1556 (void)strlcpy(oldLocalHostName, LocalHostName, 1557 sizeof(oldLocalHostName)); 1558 if (gethostname(LocalHostName, sizeof(LocalHostName))) 1559 err(EX_OSERR, "gethostname() failed"); 1560 if ((p = strchr(LocalHostName, '.')) != NULL) { 1561 *p++ = '\0'; 1562 LocalDomain = p; 1563 } else { 1564 LocalDomain = ""; 1565 } 1566 1567 /* 1568 * Close all open log files. 1569 */ 1570 Initialized = 0; 1571 for (f = Files; f != NULL; f = next) { 1572 /* flush any pending output */ 1573 if (f->f_prevcount) 1574 fprintlog(f, 0, (char *)NULL); 1575 1576 switch (f->f_type) { 1577 case F_FILE: 1578 case F_FORW: 1579 case F_CONSOLE: 1580 case F_TTY: 1581 (void)close(f->f_file); 1582 break; 1583 case F_PIPE: 1584 if (f->f_un.f_pipe.f_pid > 0) { 1585 (void)close(f->f_file); 1586 deadq_enter(f->f_un.f_pipe.f_pid, 1587 f->f_un.f_pipe.f_pname); 1588 } 1589 f->f_un.f_pipe.f_pid = 0; 1590 break; 1591 } 1592 next = f->f_next; 1593 if (f->f_program) free(f->f_program); 1594 if (f->f_host) free(f->f_host); 1595 free((char *)f); 1596 } 1597 Files = NULL; 1598 nextp = &Files; 1599 1600 /* open the configuration file */ 1601 if ((cf = fopen(ConfFile, "r")) == NULL) { 1602 dprintf("cannot open %s\n", ConfFile); 1603 *nextp = (struct filed *)calloc(1, sizeof(*f)); 1604 if (*nextp == NULL) { 1605 logerror("calloc"); 1606 exit(1); 1607 } 1608 cfline("*.ERR\t/dev/console", *nextp, "*", "*"); 1609 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 1610 if ((*nextp)->f_next == NULL) { 1611 logerror("calloc"); 1612 exit(1); 1613 } 1614 cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*"); 1615 Initialized = 1; 1616 return; 1617 } 1618 1619 /* 1620 * Foreach line in the conf table, open that file. 1621 */ 1622 f = NULL; 1623 (void)strlcpy(host, "*", sizeof(host)); 1624 (void)strlcpy(prog, "*", sizeof(prog)); 1625 while (fgets(cline, sizeof(cline), cf) != NULL) { 1626 /* 1627 * check for end-of-section, comments, strip off trailing 1628 * spaces and newline character. #!prog is treated specially: 1629 * following lines apply only to that program. 1630 */ 1631 for (p = cline; isspace(*p); ++p) 1632 continue; 1633 if (*p == 0) 1634 continue; 1635 if (*p == '#') { 1636 p++; 1637 if (*p != '!' && *p != '+' && *p != '-') 1638 continue; 1639 } 1640 if (*p == '+' || *p == '-') { 1641 host[0] = *p++; 1642 while (isspace(*p)) 1643 p++; 1644 if ((!*p) || (*p == '*')) { 1645 (void)strlcpy(host, "*", sizeof(host)); 1646 continue; 1647 } 1648 if (*p == '@') 1649 p = LocalHostName; 1650 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) { 1651 if (!isalnum(*p) && *p != '.' && *p != '-' 1652 && *p != ',' && *p != ':' && *p != '%') 1653 break; 1654 host[i] = *p++; 1655 } 1656 host[i] = '\0'; 1657 continue; 1658 } 1659 if (*p == '!') { 1660 p++; 1661 while (isspace(*p)) p++; 1662 if ((!*p) || (*p == '*')) { 1663 (void)strlcpy(prog, "*", sizeof(prog)); 1664 continue; 1665 } 1666 for (i = 0; i < LINE_MAX - 1; i++) { 1667 if (!isprint(p[i]) || isspace(p[i])) 1668 break; 1669 prog[i] = p[i]; 1670 } 1671 prog[i] = 0; 1672 continue; 1673 } 1674 for (p = cline + 1; *p != '\0'; p++) { 1675 if (*p != '#') 1676 continue; 1677 if (*(p - 1) == '\\') { 1678 strcpy(p - 1, p); 1679 p--; 1680 continue; 1681 } 1682 *p = '\0'; 1683 break; 1684 } 1685 for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--) 1686 cline[i] = '\0'; 1687 f = (struct filed *)calloc(1, sizeof(*f)); 1688 if (f == NULL) { 1689 logerror("calloc"); 1690 exit(1); 1691 } 1692 *nextp = f; 1693 nextp = &f->f_next; 1694 cfline(cline, f, prog, host); 1695 } 1696 1697 /* close the configuration file */ 1698 (void)fclose(cf); 1699 1700 Initialized = 1; 1701 1702 if (Debug) { 1703 int port; 1704 for (f = Files; f; f = f->f_next) { 1705 for (i = 0; i <= LOG_NFACILITIES; i++) 1706 if (f->f_pmask[i] == INTERNAL_NOPRI) 1707 printf("X "); 1708 else 1709 printf("%d ", f->f_pmask[i]); 1710 printf("%s: ", TypeNames[f->f_type]); 1711 switch (f->f_type) { 1712 case F_FILE: 1713 printf("%s", f->f_un.f_fname); 1714 break; 1715 1716 case F_CONSOLE: 1717 case F_TTY: 1718 printf("%s%s", _PATH_DEV, f->f_un.f_fname); 1719 break; 1720 1721 case F_FORW: 1722 port = (int)ntohs(((struct sockaddr_in *) 1723 (f->f_un.f_forw.f_addr->ai_addr))->sin_port); 1724 if (port != 514) { 1725 printf("%s:%d", 1726 f->f_un.f_forw.f_hname, port); 1727 } else { 1728 printf("%s", f->f_un.f_forw.f_hname); 1729 } 1730 break; 1731 1732 case F_PIPE: 1733 printf("%s", f->f_un.f_pipe.f_pname); 1734 break; 1735 1736 case F_USERS: 1737 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 1738 printf("%s, ", f->f_un.f_uname[i]); 1739 break; 1740 } 1741 if (f->f_program) 1742 printf(" (%s)", f->f_program); 1743 printf("\n"); 1744 } 1745 } 1746 1747 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1748 dprintf("syslogd: restarted\n"); 1749 /* 1750 * Log a change in hostname, but only on a restart. 1751 */ 1752 if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) { 1753 (void)snprintf(hostMsg, sizeof(hostMsg), 1754 "syslogd: hostname changed, \"%s\" to \"%s\"", 1755 oldLocalHostName, LocalHostName); 1756 logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE); 1757 dprintf("%s\n", hostMsg); 1758 } 1759 /* 1760 * Log the kernel boot file if we aren't going to use it as 1761 * the prefix, and if this is *not* a restart. 1762 */ 1763 if (signo == 0 && !use_bootfile) { 1764 (void)snprintf(bootfileMsg, sizeof(bootfileMsg), 1765 "syslogd: kernel boot file is %s", bootfile); 1766 logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE); 1767 dprintf("%s\n", bootfileMsg); 1768 } 1769 } 1770 1771 /* 1772 * Crack a configuration file line 1773 */ 1774 static void 1775 cfline(const char *line, struct filed *f, const char *prog, const char *host) 1776 { 1777 struct addrinfo hints, *res; 1778 int error, i, pri, syncfile; 1779 const char *p, *q; 1780 char *bp; 1781 char buf[MAXLINE], ebuf[100]; 1782 1783 dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host); 1784 1785 errno = 0; /* keep strerror() stuff out of logerror messages */ 1786 1787 /* clear out file entry */ 1788 memset(f, 0, sizeof(*f)); 1789 for (i = 0; i <= LOG_NFACILITIES; i++) 1790 f->f_pmask[i] = INTERNAL_NOPRI; 1791 1792 /* save hostname if any */ 1793 if (host && *host == '*') 1794 host = NULL; 1795 if (host) { 1796 int hl; 1797 1798 f->f_host = strdup(host); 1799 if (f->f_host == NULL) { 1800 logerror("strdup"); 1801 exit(1); 1802 } 1803 hl = strlen(f->f_host); 1804 if (hl > 0 && f->f_host[hl-1] == '.') 1805 f->f_host[--hl] = '\0'; 1806 trimdomain(f->f_host, hl); 1807 } 1808 1809 /* save program name if any */ 1810 if (prog && *prog == '*') 1811 prog = NULL; 1812 if (prog) { 1813 f->f_program = strdup(prog); 1814 if (f->f_program == NULL) { 1815 logerror("strdup"); 1816 exit(1); 1817 } 1818 } 1819 1820 /* scan through the list of selectors */ 1821 for (p = line; *p && *p != '\t' && *p != ' ';) { 1822 int pri_done; 1823 int pri_cmp; 1824 int pri_invert; 1825 1826 /* find the end of this facility name list */ 1827 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 1828 continue; 1829 1830 /* get the priority comparison */ 1831 pri_cmp = 0; 1832 pri_done = 0; 1833 pri_invert = 0; 1834 if (*q == '!') { 1835 pri_invert = 1; 1836 q++; 1837 } 1838 while (!pri_done) { 1839 switch (*q) { 1840 case '<': 1841 pri_cmp |= PRI_LT; 1842 q++; 1843 break; 1844 case '=': 1845 pri_cmp |= PRI_EQ; 1846 q++; 1847 break; 1848 case '>': 1849 pri_cmp |= PRI_GT; 1850 q++; 1851 break; 1852 default: 1853 pri_done++; 1854 break; 1855 } 1856 } 1857 1858 /* collect priority name */ 1859 for (bp = buf; *q && !strchr("\t,; ", *q); ) 1860 *bp++ = *q++; 1861 *bp = '\0'; 1862 1863 /* skip cruft */ 1864 while (strchr(",;", *q)) 1865 q++; 1866 1867 /* decode priority name */ 1868 if (*buf == '*') { 1869 pri = LOG_PRIMASK; 1870 pri_cmp = PRI_LT | PRI_EQ | PRI_GT; 1871 } else { 1872 /* Ignore trailing spaces. */ 1873 for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--) 1874 buf[i] = '\0'; 1875 1876 pri = decode(buf, prioritynames); 1877 if (pri < 0) { 1878 errno = 0; 1879 (void)snprintf(ebuf, sizeof ebuf, 1880 "unknown priority name \"%s\"", buf); 1881 logerror(ebuf); 1882 return; 1883 } 1884 } 1885 if (!pri_cmp) 1886 pri_cmp = (UniquePriority) 1887 ? (PRI_EQ) 1888 : (PRI_EQ | PRI_GT) 1889 ; 1890 if (pri_invert) 1891 pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT; 1892 1893 /* scan facilities */ 1894 while (*p && !strchr("\t.; ", *p)) { 1895 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 1896 *bp++ = *p++; 1897 *bp = '\0'; 1898 1899 if (*buf == '*') { 1900 for (i = 0; i < LOG_NFACILITIES; i++) { 1901 f->f_pmask[i] = pri; 1902 f->f_pcmp[i] = pri_cmp; 1903 } 1904 } else { 1905 i = decode(buf, facilitynames); 1906 if (i < 0) { 1907 errno = 0; 1908 (void)snprintf(ebuf, sizeof ebuf, 1909 "unknown facility name \"%s\"", 1910 buf); 1911 logerror(ebuf); 1912 return; 1913 } 1914 f->f_pmask[i >> 3] = pri; 1915 f->f_pcmp[i >> 3] = pri_cmp; 1916 } 1917 while (*p == ',' || *p == ' ') 1918 p++; 1919 } 1920 1921 p = q; 1922 } 1923 1924 /* skip to action part */ 1925 while (*p == '\t' || *p == ' ') 1926 p++; 1927 1928 if (*p == '-') { 1929 syncfile = 0; 1930 p++; 1931 } else 1932 syncfile = 1; 1933 1934 switch (*p) { 1935 case '@': 1936 { 1937 char *tp; 1938 char endkey = ':'; 1939 /* 1940 * scan forward to see if there is a port defined. 1941 * so we can't use strlcpy.. 1942 */ 1943 i = sizeof(f->f_un.f_forw.f_hname); 1944 tp = f->f_un.f_forw.f_hname; 1945 p++; 1946 1947 /* 1948 * an ipv6 address should start with a '[' in that case 1949 * we should scan for a ']' 1950 */ 1951 if (*p == '[') { 1952 p++; 1953 endkey = ']'; 1954 } 1955 while (*p && (*p != endkey) && (i-- > 0)) { 1956 *tp++ = *p++; 1957 } 1958 if (endkey == ']' && *p == endkey) 1959 p++; 1960 *tp = '\0'; 1961 } 1962 /* See if we copied a domain and have a port */ 1963 if (*p == ':') 1964 p++; 1965 else 1966 p = NULL; 1967 1968 memset(&hints, 0, sizeof(hints)); 1969 hints.ai_family = family; 1970 hints.ai_socktype = SOCK_DGRAM; 1971 error = getaddrinfo(f->f_un.f_forw.f_hname, 1972 p ? p : "syslog", &hints, &res); 1973 if (error) { 1974 logerror(gai_strerror(error)); 1975 break; 1976 } 1977 f->f_un.f_forw.f_addr = res; 1978 f->f_type = F_FORW; 1979 break; 1980 1981 case '/': 1982 if ((f->f_file = open(p, logflags, 0600)) < 0) { 1983 f->f_type = F_UNUSED; 1984 logerror(p); 1985 break; 1986 } 1987 if (syncfile) 1988 f->f_flags |= FFLAG_SYNC; 1989 if (isatty(f->f_file)) { 1990 if (strcmp(p, ctty) == 0) 1991 f->f_type = F_CONSOLE; 1992 else 1993 f->f_type = F_TTY; 1994 (void)strlcpy(f->f_un.f_fname, p + sizeof(_PATH_DEV) - 1, 1995 sizeof(f->f_un.f_fname)); 1996 } else { 1997 (void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname)); 1998 f->f_type = F_FILE; 1999 } 2000 break; 2001 2002 case '|': 2003 f->f_un.f_pipe.f_pid = 0; 2004 (void)strlcpy(f->f_un.f_pipe.f_pname, p + 1, 2005 sizeof(f->f_un.f_pipe.f_pname)); 2006 f->f_type = F_PIPE; 2007 break; 2008 2009 case '*': 2010 f->f_type = F_WALL; 2011 break; 2012 2013 default: 2014 for (i = 0; i < MAXUNAMES && *p; i++) { 2015 for (q = p; *q && *q != ','; ) 2016 q++; 2017 (void)strncpy(f->f_un.f_uname[i], p, MAXLOGNAME - 1); 2018 if ((q - p) >= MAXLOGNAME) 2019 f->f_un.f_uname[i][MAXLOGNAME - 1] = '\0'; 2020 else 2021 f->f_un.f_uname[i][q - p] = '\0'; 2022 while (*q == ',' || *q == ' ') 2023 q++; 2024 p = q; 2025 } 2026 f->f_type = F_USERS; 2027 break; 2028 } 2029 } 2030 2031 2032 /* 2033 * Decode a symbolic name to a numeric value 2034 */ 2035 static int 2036 decode(const char *name, const CODE *codetab) 2037 { 2038 const CODE *c; 2039 char *p, buf[40]; 2040 2041 if (isdigit(*name)) 2042 return (atoi(name)); 2043 2044 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 2045 if (isupper(*name)) 2046 *p = tolower(*name); 2047 else 2048 *p = *name; 2049 } 2050 *p = '\0'; 2051 for (c = codetab; c->c_name; c++) 2052 if (!strcmp(buf, c->c_name)) 2053 return (c->c_val); 2054 2055 return (-1); 2056 } 2057 2058 static void 2059 markit(void) 2060 { 2061 struct filed *f; 2062 dq_t q, next; 2063 2064 now = time((time_t *)NULL); 2065 MarkSeq += TIMERINTVL; 2066 if (MarkSeq >= MarkInterval) { 2067 logmsg(LOG_INFO, "-- MARK --", 2068 LocalHostName, ADDDATE|MARK); 2069 MarkSeq = 0; 2070 } 2071 2072 for (f = Files; f; f = f->f_next) { 2073 if (f->f_prevcount && now >= REPEATTIME(f)) { 2074 dprintf("flush %s: repeated %d times, %d sec.\n", 2075 TypeNames[f->f_type], f->f_prevcount, 2076 repeatinterval[f->f_repeatcount]); 2077 fprintlog(f, 0, (char *)NULL); 2078 BACKOFF(f); 2079 } 2080 } 2081 2082 /* Walk the dead queue, and see if we should signal somebody. */ 2083 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = next) { 2084 next = TAILQ_NEXT(q, dq_entries); 2085 2086 switch (q->dq_timeout) { 2087 case 0: 2088 /* Already signalled once, try harder now. */ 2089 if (kill(q->dq_pid, SIGKILL) != 0) 2090 (void)deadq_remove(q->dq_pid); 2091 break; 2092 2093 case 1: 2094 /* 2095 * Timed out on dead queue, send terminate 2096 * signal. Note that we leave the removal 2097 * from the dead queue to reapchild(), which 2098 * will also log the event (unless the process 2099 * didn't even really exist, in case we simply 2100 * drop it from the dead queue). 2101 */ 2102 if (kill(q->dq_pid, SIGTERM) != 0) 2103 (void)deadq_remove(q->dq_pid); 2104 /* FALLTHROUGH */ 2105 2106 default: 2107 q->dq_timeout--; 2108 } 2109 } 2110 MarkSet = 0; 2111 (void)alarm(TIMERINTVL); 2112 } 2113 2114 /* 2115 * fork off and become a daemon, but wait for the child to come online 2116 * before returing to the parent, or we get disk thrashing at boot etc. 2117 * Set a timer so we don't hang forever if it wedges. 2118 */ 2119 static int 2120 waitdaemon(int nochdir, int noclose, int maxwait) 2121 { 2122 int fd; 2123 int status; 2124 pid_t pid, childpid; 2125 2126 switch (childpid = fork()) { 2127 case -1: 2128 return (-1); 2129 case 0: 2130 break; 2131 default: 2132 signal(SIGALRM, timedout); 2133 alarm(maxwait); 2134 while ((pid = wait3(&status, 0, NULL)) != -1) { 2135 if (WIFEXITED(status)) 2136 errx(1, "child pid %d exited with return code %d", 2137 pid, WEXITSTATUS(status)); 2138 if (WIFSIGNALED(status)) 2139 errx(1, "child pid %d exited on signal %d%s", 2140 pid, WTERMSIG(status), 2141 WCOREDUMP(status) ? " (core dumped)" : 2142 ""); 2143 if (pid == childpid) /* it's gone... */ 2144 break; 2145 } 2146 exit(0); 2147 } 2148 2149 if (setsid() == -1) 2150 return (-1); 2151 2152 if (!nochdir) 2153 (void)chdir("/"); 2154 2155 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 2156 (void)dup2(fd, STDIN_FILENO); 2157 (void)dup2(fd, STDOUT_FILENO); 2158 (void)dup2(fd, STDERR_FILENO); 2159 if (fd > 2) 2160 (void)close (fd); 2161 } 2162 return (getppid()); 2163 } 2164 2165 /* 2166 * We get a SIGALRM from the child when it's running and finished doing it's 2167 * fsync()'s or O_SYNC writes for all the boot messages. 2168 * 2169 * We also get a signal from the kernel if the timer expires, so check to 2170 * see what happened. 2171 */ 2172 static void 2173 timedout(int sig __unused) 2174 { 2175 int left; 2176 left = alarm(0); 2177 signal(SIGALRM, SIG_DFL); 2178 if (left == 0) 2179 errx(1, "timed out waiting for child"); 2180 else 2181 _exit(0); 2182 } 2183 2184 /* 2185 * Add `s' to the list of allowable peer addresses to accept messages 2186 * from. 2187 * 2188 * `s' is a string in the form: 2189 * 2190 * [*]domainname[:{servicename|portnumber|*}] 2191 * 2192 * or 2193 * 2194 * netaddr/maskbits[:{servicename|portnumber|*}] 2195 * 2196 * Returns -1 on error, 0 if the argument was valid. 2197 */ 2198 static int 2199 allowaddr(char *s) 2200 { 2201 char *cp1, *cp2; 2202 struct allowedpeer ap; 2203 struct servent *se; 2204 int masklen = -1; 2205 struct addrinfo hints, *res; 2206 struct in_addr *addrp, *maskp; 2207 #ifdef INET6 2208 int i; 2209 u_int32_t *addr6p, *mask6p; 2210 #endif 2211 char ip[NI_MAXHOST]; 2212 2213 #ifdef INET6 2214 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL) 2215 #endif 2216 cp1 = s; 2217 if ((cp1 = strrchr(cp1, ':'))) { 2218 /* service/port provided */ 2219 *cp1++ = '\0'; 2220 if (strlen(cp1) == 1 && *cp1 == '*') 2221 /* any port allowed */ 2222 ap.port = 0; 2223 else if ((se = getservbyname(cp1, "udp"))) { 2224 ap.port = ntohs(se->s_port); 2225 } else { 2226 ap.port = strtol(cp1, &cp2, 0); 2227 if (*cp2 != '\0') 2228 return (-1); /* port not numeric */ 2229 } 2230 } else { 2231 if ((se = getservbyname("syslog", "udp"))) 2232 ap.port = ntohs(se->s_port); 2233 else 2234 /* sanity, should not happen */ 2235 ap.port = 514; 2236 } 2237 2238 if ((cp1 = strchr(s, '/')) != NULL && 2239 strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) { 2240 *cp1 = '\0'; 2241 if ((masklen = atoi(cp1 + 1)) < 0) 2242 return (-1); 2243 } 2244 #ifdef INET6 2245 if (*s == '[') { 2246 cp2 = s + strlen(s) - 1; 2247 if (*cp2 == ']') { 2248 ++s; 2249 *cp2 = '\0'; 2250 } else { 2251 cp2 = NULL; 2252 } 2253 } else { 2254 cp2 = NULL; 2255 } 2256 #endif 2257 memset(&hints, 0, sizeof(hints)); 2258 hints.ai_family = PF_UNSPEC; 2259 hints.ai_socktype = SOCK_DGRAM; 2260 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2261 if (getaddrinfo(s, NULL, &hints, &res) == 0) { 2262 ap.isnumeric = 1; 2263 memcpy(&ap.a_addr, res->ai_addr, res->ai_addrlen); 2264 memset(&ap.a_mask, 0, sizeof(ap.a_mask)); 2265 ap.a_mask.ss_family = res->ai_family; 2266 if (res->ai_family == AF_INET) { 2267 ap.a_mask.ss_len = sizeof(struct sockaddr_in); 2268 maskp = &((struct sockaddr_in *)&ap.a_mask)->sin_addr; 2269 addrp = &((struct sockaddr_in *)&ap.a_addr)->sin_addr; 2270 if (masklen < 0) { 2271 /* use default netmask */ 2272 if (IN_CLASSA(ntohl(addrp->s_addr))) 2273 maskp->s_addr = htonl(IN_CLASSA_NET); 2274 else if (IN_CLASSB(ntohl(addrp->s_addr))) 2275 maskp->s_addr = htonl(IN_CLASSB_NET); 2276 else 2277 maskp->s_addr = htonl(IN_CLASSC_NET); 2278 } else if (masklen <= 32) { 2279 /* convert masklen to netmask */ 2280 if (masklen == 0) 2281 maskp->s_addr = 0; 2282 else 2283 maskp->s_addr = htonl(~((1 << (32 - masklen)) - 1)); 2284 } else { 2285 freeaddrinfo(res); 2286 return (-1); 2287 } 2288 /* Lose any host bits in the network number. */ 2289 addrp->s_addr &= maskp->s_addr; 2290 } 2291 #ifdef INET6 2292 else if (res->ai_family == AF_INET6 && masklen <= 128) { 2293 ap.a_mask.ss_len = sizeof(struct sockaddr_in6); 2294 if (masklen < 0) 2295 masklen = 128; 2296 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2297 /* convert masklen to netmask */ 2298 while (masklen > 0) { 2299 if (masklen < 32) { 2300 *mask6p = htonl(~(0xffffffff >> masklen)); 2301 break; 2302 } 2303 *mask6p++ = 0xffffffff; 2304 masklen -= 32; 2305 } 2306 /* Lose any host bits in the network number. */ 2307 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2308 addr6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_addr)->sin6_addr; 2309 for (i = 0; i < 4; i++) 2310 addr6p[i] &= mask6p[i]; 2311 } 2312 #endif 2313 else { 2314 freeaddrinfo(res); 2315 return (-1); 2316 } 2317 freeaddrinfo(res); 2318 } else { 2319 /* arg `s' is domain name */ 2320 ap.isnumeric = 0; 2321 ap.a_name = s; 2322 if (cp1) 2323 *cp1 = '/'; 2324 #ifdef INET6 2325 if (cp2) { 2326 *cp2 = ']'; 2327 --s; 2328 } 2329 #endif 2330 } 2331 2332 if (Debug) { 2333 printf("allowaddr: rule %d: ", NumAllowed); 2334 if (ap.isnumeric) { 2335 printf("numeric, "); 2336 getnameinfo((struct sockaddr *)&ap.a_addr, 2337 ((struct sockaddr *)&ap.a_addr)->sa_len, 2338 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2339 printf("addr = %s, ", ip); 2340 getnameinfo((struct sockaddr *)&ap.a_mask, 2341 ((struct sockaddr *)&ap.a_mask)->sa_len, 2342 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2343 printf("mask = %s; ", ip); 2344 } else { 2345 printf("domainname = %s; ", ap.a_name); 2346 } 2347 printf("port = %d\n", ap.port); 2348 } 2349 2350 if ((AllowedPeers = realloc(AllowedPeers, 2351 ++NumAllowed * sizeof(struct allowedpeer))) 2352 == NULL) { 2353 logerror("realloc"); 2354 exit(1); 2355 } 2356 memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer)); 2357 return (0); 2358 } 2359 2360 /* 2361 * Validate that the remote peer has permission to log to us. 2362 */ 2363 static int 2364 validate(struct sockaddr *sa, const char *hname) 2365 { 2366 int i; 2367 size_t l1, l2; 2368 char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV]; 2369 struct allowedpeer *ap; 2370 struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL; 2371 #ifdef INET6 2372 int j, reject; 2373 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL; 2374 #endif 2375 struct addrinfo hints, *res; 2376 u_short sport; 2377 2378 if (NumAllowed == 0) 2379 /* traditional behaviour, allow everything */ 2380 return (1); 2381 2382 (void)strlcpy(name, hname, sizeof(name)); 2383 memset(&hints, 0, sizeof(hints)); 2384 hints.ai_family = PF_UNSPEC; 2385 hints.ai_socktype = SOCK_DGRAM; 2386 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2387 if (getaddrinfo(name, NULL, &hints, &res) == 0) 2388 freeaddrinfo(res); 2389 else if (strchr(name, '.') == NULL) { 2390 strlcat(name, ".", sizeof name); 2391 strlcat(name, LocalDomain, sizeof name); 2392 } 2393 if (getnameinfo(sa, sa->sa_len, ip, sizeof ip, port, sizeof port, 2394 NI_NUMERICHOST | NI_NUMERICSERV) != 0) 2395 return (0); /* for safety, should not occur */ 2396 dprintf("validate: dgram from IP %s, port %s, name %s;\n", 2397 ip, port, name); 2398 sport = atoi(port); 2399 2400 /* now, walk down the list */ 2401 for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) { 2402 if (ap->port != 0 && ap->port != sport) { 2403 dprintf("rejected in rule %d due to port mismatch.\n", i); 2404 continue; 2405 } 2406 2407 if (ap->isnumeric) { 2408 if (ap->a_addr.ss_family != sa->sa_family) { 2409 dprintf("rejected in rule %d due to address family mismatch.\n", i); 2410 continue; 2411 } 2412 if (ap->a_addr.ss_family == AF_INET) { 2413 sin4 = (struct sockaddr_in *)sa; 2414 a4p = (struct sockaddr_in *)&ap->a_addr; 2415 m4p = (struct sockaddr_in *)&ap->a_mask; 2416 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr) 2417 != a4p->sin_addr.s_addr) { 2418 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2419 continue; 2420 } 2421 } 2422 #ifdef INET6 2423 else if (ap->a_addr.ss_family == AF_INET6) { 2424 sin6 = (struct sockaddr_in6 *)sa; 2425 a6p = (struct sockaddr_in6 *)&ap->a_addr; 2426 m6p = (struct sockaddr_in6 *)&ap->a_mask; 2427 if (a6p->sin6_scope_id != 0 && 2428 sin6->sin6_scope_id != a6p->sin6_scope_id) { 2429 dprintf("rejected in rule %d due to scope mismatch.\n", i); 2430 continue; 2431 } 2432 reject = 0; 2433 for (j = 0; j < 16; j += 4) { 2434 if ((*(u_int32_t *)&sin6->sin6_addr.s6_addr[j] & *(u_int32_t *)&m6p->sin6_addr.s6_addr[j]) 2435 != *(u_int32_t *)&a6p->sin6_addr.s6_addr[j]) { 2436 ++reject; 2437 break; 2438 } 2439 } 2440 if (reject) { 2441 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2442 continue; 2443 } 2444 } 2445 #endif 2446 else 2447 continue; 2448 } else { 2449 cp = ap->a_name; 2450 l1 = strlen(name); 2451 if (*cp == '*') { 2452 /* allow wildmatch */ 2453 cp++; 2454 l2 = strlen(cp); 2455 if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) { 2456 dprintf("rejected in rule %d due to name mismatch.\n", i); 2457 continue; 2458 } 2459 } else { 2460 /* exact match */ 2461 l2 = strlen(cp); 2462 if (l2 != l1 || memcmp(cp, name, l1) != 0) { 2463 dprintf("rejected in rule %d due to name mismatch.\n", i); 2464 continue; 2465 } 2466 } 2467 } 2468 dprintf("accepted in rule %d.\n", i); 2469 return (1); /* hooray! */ 2470 } 2471 return (0); 2472 } 2473 2474 /* 2475 * Fairly similar to popen(3), but returns an open descriptor, as 2476 * opposed to a FILE *. 2477 */ 2478 static int 2479 p_open(const char *prog, pid_t *rpid) 2480 { 2481 int pfd[2], nulldesc; 2482 pid_t pid; 2483 sigset_t omask, mask; 2484 char *argv[4]; /* sh -c cmd NULL */ 2485 char errmsg[200]; 2486 2487 if (pipe(pfd) == -1) 2488 return (-1); 2489 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 2490 /* we are royally screwed anyway */ 2491 return (-1); 2492 2493 sigemptyset(&mask); 2494 sigaddset(&mask, SIGALRM); 2495 sigaddset(&mask, SIGHUP); 2496 sigprocmask(SIG_BLOCK, &mask, &omask); 2497 switch ((pid = fork())) { 2498 case -1: 2499 sigprocmask(SIG_SETMASK, &omask, 0); 2500 close(nulldesc); 2501 return (-1); 2502 2503 case 0: 2504 argv[0] = strdup("sh"); 2505 argv[1] = strdup("-c"); 2506 argv[2] = strdup(prog); 2507 argv[3] = NULL; 2508 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) { 2509 logerror("strdup"); 2510 exit(1); 2511 } 2512 2513 alarm(0); 2514 (void)setsid(); /* Avoid catching SIGHUPs. */ 2515 2516 /* 2517 * Throw away pending signals, and reset signal 2518 * behaviour to standard values. 2519 */ 2520 signal(SIGALRM, SIG_IGN); 2521 signal(SIGHUP, SIG_IGN); 2522 sigprocmask(SIG_SETMASK, &omask, 0); 2523 signal(SIGPIPE, SIG_DFL); 2524 signal(SIGQUIT, SIG_DFL); 2525 signal(SIGALRM, SIG_DFL); 2526 signal(SIGHUP, SIG_DFL); 2527 2528 dup2(pfd[0], STDIN_FILENO); 2529 dup2(nulldesc, STDOUT_FILENO); 2530 dup2(nulldesc, STDERR_FILENO); 2531 closefrom(3); 2532 2533 (void)execvp(_PATH_BSHELL, argv); 2534 _exit(255); 2535 } 2536 2537 sigprocmask(SIG_SETMASK, &omask, 0); 2538 close(nulldesc); 2539 close(pfd[0]); 2540 /* 2541 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 2542 * supposed to get an EWOULDBLOCK on writev(2), which is 2543 * caught by the logic above anyway, which will in turn close 2544 * the pipe, and fork a new logging subprocess if necessary. 2545 * The stale subprocess will be killed some time later unless 2546 * it terminated itself due to closing its input pipe (so we 2547 * get rid of really dead puppies). 2548 */ 2549 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 2550 /* This is bad. */ 2551 (void)snprintf(errmsg, sizeof errmsg, 2552 "Warning: cannot change pipe to PID %d to " 2553 "non-blocking behaviour.", 2554 (int)pid); 2555 logerror(errmsg); 2556 } 2557 *rpid = pid; 2558 return (pfd[1]); 2559 } 2560 2561 static void 2562 deadq_enter(pid_t pid, const char *name) 2563 { 2564 dq_t p; 2565 int status; 2566 2567 /* 2568 * Be paranoid, if we can't signal the process, don't enter it 2569 * into the dead queue (perhaps it's already dead). If possible, 2570 * we try to fetch and log the child's status. 2571 */ 2572 if (kill(pid, 0) != 0) { 2573 if (waitpid(pid, &status, WNOHANG) > 0) 2574 log_deadchild(pid, status, name); 2575 return; 2576 } 2577 2578 p = malloc(sizeof(struct deadq_entry)); 2579 if (p == NULL) { 2580 logerror("malloc"); 2581 exit(1); 2582 } 2583 2584 p->dq_pid = pid; 2585 p->dq_timeout = DQ_TIMO_INIT; 2586 TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries); 2587 } 2588 2589 static int 2590 deadq_remove(pid_t pid) 2591 { 2592 dq_t q; 2593 2594 TAILQ_FOREACH(q, &deadq_head, dq_entries) { 2595 if (q->dq_pid == pid) { 2596 TAILQ_REMOVE(&deadq_head, q, dq_entries); 2597 free(q); 2598 return (1); 2599 } 2600 } 2601 2602 return (0); 2603 } 2604 2605 static void 2606 log_deadchild(pid_t pid, int status, const char *name) 2607 { 2608 int code; 2609 char buf[256]; 2610 const char *reason; 2611 2612 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 2613 if (WIFSIGNALED(status)) { 2614 reason = "due to signal"; 2615 code = WTERMSIG(status); 2616 } else { 2617 reason = "with status"; 2618 code = WEXITSTATUS(status); 2619 if (code == 0) 2620 return; 2621 } 2622 (void)snprintf(buf, sizeof buf, 2623 "Logging subprocess %d (%s) exited %s %d.", 2624 pid, name, reason, code); 2625 logerror(buf); 2626 } 2627 2628 static int * 2629 socksetup(int af, char *bindhostname) 2630 { 2631 struct addrinfo hints, *res, *r; 2632 const char *bindservice; 2633 char *cp; 2634 int error, maxs, *s, *socks; 2635 2636 /* 2637 * We have to handle this case for backwards compatibility: 2638 * If there are two (or more) colons but no '[' and ']', 2639 * assume this is an inet6 address without a service. 2640 */ 2641 bindservice = "syslog"; 2642 if (bindhostname != NULL) { 2643 #ifdef INET6 2644 if (*bindhostname == '[' && 2645 (cp = strchr(bindhostname + 1, ']')) != NULL) { 2646 ++bindhostname; 2647 *cp = '\0'; 2648 if (cp[1] == ':' && cp[2] != '\0') 2649 bindservice = cp + 2; 2650 } else { 2651 #endif 2652 cp = strchr(bindhostname, ':'); 2653 if (cp != NULL && strchr(cp + 1, ':') == NULL) { 2654 *cp = '\0'; 2655 if (cp[1] != '\0') 2656 bindservice = cp + 1; 2657 if (cp == bindhostname) 2658 bindhostname = NULL; 2659 } 2660 #ifdef INET6 2661 } 2662 #endif 2663 } 2664 2665 memset(&hints, 0, sizeof(hints)); 2666 hints.ai_flags = AI_PASSIVE; 2667 hints.ai_family = af; 2668 hints.ai_socktype = SOCK_DGRAM; 2669 error = getaddrinfo(bindhostname, bindservice, &hints, &res); 2670 if (error) { 2671 logerror(gai_strerror(error)); 2672 errno = 0; 2673 die(0); 2674 } 2675 2676 /* Count max number of sockets we may open */ 2677 for (maxs = 0, r = res; r; r = r->ai_next, maxs++); 2678 socks = malloc((maxs+1) * sizeof(int)); 2679 if (socks == NULL) { 2680 logerror("couldn't allocate memory for sockets"); 2681 die(0); 2682 } 2683 2684 *socks = 0; /* num of sockets counter at start of array */ 2685 s = socks + 1; 2686 for (r = res; r; r = r->ai_next) { 2687 int on = 1; 2688 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 2689 if (*s < 0) { 2690 logerror("socket"); 2691 continue; 2692 } 2693 #ifdef INET6 2694 if (r->ai_family == AF_INET6) { 2695 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 2696 (char *)&on, sizeof (on)) < 0) { 2697 logerror("setsockopt"); 2698 close(*s); 2699 continue; 2700 } 2701 } 2702 #endif 2703 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 2704 (char *)&on, sizeof (on)) < 0) { 2705 logerror("setsockopt"); 2706 close(*s); 2707 continue; 2708 } 2709 /* 2710 * RFC 3164 recommends that client side message 2711 * should come from the privileged syslogd port. 2712 * 2713 * If the system administrator choose not to obey 2714 * this, we can skip the bind() step so that the 2715 * system will choose a port for us. 2716 */ 2717 if (!NoBind) { 2718 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 2719 logerror("bind"); 2720 close(*s); 2721 continue; 2722 } 2723 2724 if (!SecureMode) 2725 increase_rcvbuf(*s); 2726 } 2727 2728 (*socks)++; 2729 s++; 2730 } 2731 2732 if (*socks == 0) { 2733 free(socks); 2734 if (Debug) 2735 return (NULL); 2736 else 2737 die(0); 2738 } 2739 if (res) 2740 freeaddrinfo(res); 2741 2742 return (socks); 2743 } 2744 2745 static void 2746 increase_rcvbuf(int fd) 2747 { 2748 socklen_t len, slen; 2749 2750 slen = sizeof(len); 2751 2752 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, &slen) == 0) { 2753 if (len < RCVBUF_MINSIZE) { 2754 len = RCVBUF_MINSIZE; 2755 setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len)); 2756 } 2757 } 2758 } 2759